ACE:How to bind more VIPs' status, one VIP down, others also down

As we know, a WEB2.0 business is consist of more services, and those services communicte with each other.
If one service shutdown, and failover to another DataCenter, other services must talk with it cross datacenter, that will reduce the whole system's performance, so we need bundle failover those services.
One service has a VIP, my question is how to bind those services' VIP status.
I expect if one VIP down, the other VIP also down.
I appreciate your help.
Thanks
-Smith

Hi Smith,
There may be more than one way to accomplish this and I'm not sure which would be the best way, but here is one that comes to mind:
VIP-A --> Serverfarm-A --> Rserver-A
VIP-B --> Serverfarm-B --> Rserver-B
Let's say you have VIP-A and VIP-B that you want to failover together, even if only one of them goes down at a local datacenter. Since you can apply more than one probe to a serverfarm, and that the default behavior is that if just one probe fails the rserver is down, then you could have Serverfarm-A and Serverfarm-B both probing Rserver-A and Rserver-B. This way, if either Rserver-A or Rserver-B application goes down, both serverfarms will go down. Now the ACE can switch the serverfarm for both VIPs to the backup serverfarm, which would reside at the backup datacenter.
Hope this helps,
Sean

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3    values ('staple card', 'word2', 'word3')
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7    values ('staplecard', 'word2', 'word3')
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3    return         varchar2
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6    v_string_out varchar2 (32767);
7    v_string_in1 varchar2 (32767);
8    v_string_in2 varchar2 (32767);
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57 /
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SCOTT@orcl_11gR2> show errors
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2 /
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